I have a small question. I was trying to get the hdri lighting only through the windows. As you can see, my model has one side of its face open and I don't want the hdri lighting to affect the open side, I want the lighting only from the Windows. The only way I can stop the lighting from affecting the model is to create two opaque planes along it, but I need to be able to see the inside of it without having the hdri lighting affecting it. How can I do it ?
I'd suggest not using an HDRI, just use a plane with an emit shader,
To the question at hand, you can place planes to block light and then hide them by pressing H, alternatively you can set the display mode to wire, that way it will still be opaque at render time but not in viewport.
additionally I'd recommend using a portal on the window to better performance.
At the moment that scene will be very heavy to render and you won't be reaping much benefit from an HDRI, just a warning, if your PC can handle it no problem.